A girl, 16, has been arrested on suspicion of a terrorism offence.
The teenager was detained at a house in Longsight, Manchester by officers from the North West Counter-Terrorism Unit and the Tactical Aid Unit, police said.
She was questioned on suspicion of engaging in the preparation of acts of terrorism, and bailed until 28 May.
Police said her arrest was not linked to the detention of nine people from Rochdale on the Turkey-Syria border earlier this week.
The group, including five adults and four children, was seized in Hatay on 1 April.
Their intention in travelling to the region, where areas are controlled by Islamic State (IS) militants or an al-Qaeda affiliate, is being investigated.